Printing-machine



(No Model.)

' J. T. HAWKINS.

, PRINTING MACHINE.

No. 423,153 Patented Mar. 11', 1890.

N. PETERS. Pholo-Llfhographer, Washlngion. n. c

UNITE STATES PATENT O ICE...

JOHN T; HAWVKINS, OF TAUNTQN, MASSACHUSETTS.

PRlNTlNG- MACHINE.

SPECIFICATION forming part a Letters Patent No. 423,153,dated March 11, 1890.

Application filed March 20, 1888 Serial No. 267,797. (No model.)

To all whom it may concern:

Be it known that 1, JOHN T. HAWKINS, of Taunton, in the county of Bristol and State of Massachusetts, have invented new and useful Improvements in Printing Machines, which invention is fully set forth and illustrated in the following specification and accompanying drawings.

The object of this invention is to simplify and cheapen sundry parts of a cylinder print ing-press having such reversing mechanism as is shown in Patent No. 56,701, issued July 31, 1866.

It is also its object to provide for making changes in the adjustment of the impression by adjusting the bed to the cylinder instead of adjusting the cylinder to the bed, as heretofore done, and to limit the amount of covering to be placed upon the impression-segment of the impression-cylinder to only such as will insure equality of surface velocity befl tween the bed and cylinder in the operationof securing the required pressure between the 'bed or form and said cylinder to make the impression upon the sheet to beprinted. i

It is also a further object to avoid certainf unmechanical features in theiabove -'m'entioned machine, more fully hereinafter explained.

In the patented machine above mentioned it is essential that the relations as to distance between the centers existing between the large segmental gear and the outer reversingpinion be very accurately maintained, and therefore any vertical adjustment of the impression-cylinder to or from the bed for purposes of varying the impression requires a corresponding movement of said reversingpinion, and to insure this the construction is as follows: The cylinder-shaft is carried in vertically adjustable boxes, while the outer end of the reversing shaft is carried in a hanger connected to one of said sliding boxes by a link, thus maintaining a constant relation between the aforesaid large segmental gear and the outer reversing pinion. As, however, the bedn'ack pinion on the inner end of the reversing shaft engages a rack (but not shown in said patented drawing) on the under side of the bed whose vertical position is unchangeable, a variation in the vertical position of theouter reversing-pinion affects the I parallelism of the reversing-shaft with the bed and interfereswith the proper and theoretically correct operation of the inner reversing-pinion and the rack which it engages, and after wear of the parts and consequent considerable lowering of the type-bed and equivalent lowering adjustment of the impressioncylinder to meet it this disturbance becomes considerable and sufficient to interfere with the proper working of the parts.

This invention will first be described in de tail, and then particularly set forth in the claims.

In the accompanying drawings, Figure 1 is a longitudinal vertical section of so much of this general form of printing-machine as is necessary to clearly illustrate the same. Fig.

versing-pinion whichengages the spur-segments of'the segmental cylinder-gear; 7, the reversing-shaft, and 8 the bed-rack pinion, both the parts 6 and 8 being secured to the reversing shaft 7. A rack 9 is attached to the under side of the bed 1, engaging the bed-rack pinion 8. The inner end of the reversing-shaft 7 is journaled in a bracket 10, secured to the main cross-stay 11, and said shafts outer end is journ aled in a fixed position in the frame 2. The force of the impression is received upon four or more rollers 12, immediately under the center line of the impression-cylinder. The rollers 12 are journaled in brackets 13, secured to the upper face-of the cross stay 11, which brackets are vertically adjustable by means of packing inserted between their bases and the upper surface of the cross stay 11-such as paper or other suitable materialas indicated by the lines marked as under the respective brackets 13. The cylinder-shaft 14: is jouradjustment. Journaled on studs 16in the frames 1 and 2 are rollers 17 to receive the weight of the bed when run out from under the cylinder in either direction. A drivingpinion 18 engages the continuous segment of the cylinder-gear 5, through which motion is;

communicated to the whole mechanism by means of the shaft 19, to which said pinion is secured.

The reversing-pinion 6 has secured 5 in it at opposite points and projecting from its face toward the large wheel 5 two pins 21, which are preferably constructed with antifriction rollers on their projecting ends, and these pinsor their rollers engage the curved f grooveformed by the cams 20, causing reversal of the direction of the reversing-shaft. 7 and its alternate engagement of the inter: nal and external spur-segments'of the large wheel 15, as is fully described in the patent numbered 56,701, above mentioned. It'is obvious that in this construction the vertical adjustment of the rollers 12 need only be made to'comip'ensate for the Wear of the parts, that when the proper height of' the upper surface of the bed is fixed by the adjustment of the rollers 12, so that type high forms will receive the necessary pressurewith the proper amount of covering on the printing-segment of the cylinder, the pressure upon the form can'only be varied from its proper limit by too little or too much cylinder-covering. In either of 7 these cases the surface Velocity of the cylin-f der will not coincidewith the velocity of the bed. '"In this construction, therefore, putting the proper'amount of covering upon the cylinder gives theproper pressure, or, conversely, obtaining the desired pressure by placing ithelnecessary thickness of covering on the cylinder'decides theproper amount of covering to be carried on the cylinder in order to have uniform velocity of bed and cylinder, and these conditions can always be ingi'n erely the 'Weight of the bed to support maintained by keepin'g the brackets 13 and their rollers12 packed up tocornpensate for any Wear of parts. The outer rollers 17,h'av-.

when run out toward the extremities of its; motion, and being preferably slightly lower than the rollers 12', are journaled 011 eccen-t trio-studs, by means of which their height;

7 may be Varied, as shown in the several figures ning in fixed or non-adjustable bearings, as 15, and a type-bed, as 4, supported upon a series of vertically-adjustable rollers under the line of the impression, whereby the bed is so adjusted to the cylinder that clothing the cylinder with the proper amountiofcovering to give the necessary pressure will 'fix the virtual diameter of the printing-segment offsaid cylinder, thereby insuring equal velocities between 'said bed and cylinder without vertical adjustment of said cylinderand 'consequent disturbance of the proper relations of parts connected therewith,substantially as set forth. I I

2. "In a cylinder printing-machine, the combination of thefollowingelements; an impression-cylinder, as 3, journaled in or non-adjustable bearings in themain frames,

a type-bed, as 4, supported upon a series of rollers journaled in vertically adjustable brackets under the line of the impression, a segmental gear-wheel, as 5, "secured to the axis of 'the cylinder and containingan'external and. internal spur-segment and two sets of suitably-formed cams, as 20, a reversing- 6o bination of an impression-cylinder, as 3, runshaft, as 7, journaled at'its outer end in a fixed bearing in one of the mainframes and at its inner end iua suitably-fixed bracket or bearing, as 10, said shaft carrying on its outer end a spur reversing-pinion, as 6, engaging said internal and external spur-segments and carrying pins or rollers, as 21, engaging said cam's,'a'nd said shaft carrying upon its inner end apinion, as 8, engaging a rackfas 9,se-

cured to the under side of said 'type bed, all

combined, arranged, and operatingsubstan- 'tiallyas and for the purposes setforth.

7 JOHN T. HAWKINS. Witnesses:

ELrsHA T. JACKSON, J; F. HALEY. 

